Who had to be sacrificed to a sea monster because her mother Cassiopeia offended the gods?

Andromeda was the princess who had to be sacrificed to a sea monster because her mother, Cassiopeia, offended the gods by boasting that Andromeda was more beautiful than the Nereids. As punishment, Poseidon sent the sea monster Cetus to ravage the kingdom, and to appease the gods, Andromeda was chained to a rock as a sacrifice. She was ultimately saved by the hero Perseus.